List of 7 ancestors found in 40 iterations (7 distinct persons and 7 positions into tree)

Generation 0 - 1 person(s) on 1 (1 distinct persons)
1Gauthier Ier de Lens (~1035-)
Generation 1 - 2 person(s) on 2 (2 distinct persons)
2Robert II de Bethune (1010-1071)
3Berthilde d'Ollehain (1019-1073)
Generation 2 - 2 person(s) on 4 (2 distinct persons)
6Wauthier III d'Ollehain (~0987-1039)
7Gisèle de Hainaut (~0998-1049)
Generation 3 - 2 person(s) on 8 (2 distinct persons)
12Wauthier II d'Olhain (~0953-1013)
13Blanche d'Hersin (~0964-1003)